I used to use NVIDIA GPU T4 in Google Cloud zone europe-central2-b before, but now it is not available since about 4 days ago. Is that normal for such a long time, or does it happen that google removes GPU's? I have already transferred my disk from other region where NVIDIA became unavailable long term and moving data to other region costs money. I would like to avoid that. So if GPU is not available for 4 day, should I keep trying or should I give up?
If you have a designated person that processes your account, you may contact them for faster reservation. The other way is you can create reservations on the console to reserve resources that are needed for your workloads. In this way, you can mitigate transferring to another zone/region.
To verify your issue, you can check your logging with error message
ZONE\_RESOURCE\_POOL\_EXHAUSTED that indicates the resources you request is currently not available on the zone or region.
Additionally, you may read this thread regarding resources that are not available on a certain region/zone.